2 Vocabulary Chemical Energy Current Electrical Energy Energy Kinetic Energy Mechanical Energy Potential Energy Voltage
3 Work is when an applied force cause a change in motion, heat, or light in another object A Bicyclist pedals of his bike and the bike moves A magnet pulls a piece of medal towards itself A log burns What is ENERGY???
4 Energy is the ability to do work The bicyclist has energy which he uses to propel his bike The magnet and piece of metal, when held at a distance, the magnet has energy to move the metal The log has energy so that when burned it will emit heat and light What is ENERGY???
5 There are two different forms of energy Kinetic Energy Potential Energy There are many different types Mechanical Chemical Electrical Etc. What is ENERGY???
6 The energy stored in an object is called potential energy. The energy of motion is called kinetic energy. Both kinetic and potential energy are caused by a force. Potential vs. Kinetic Energy
7 Transformation From Potential to Kinetic Potential energy can be transformed into kinetic energy. This is done by allowing an object or particle to move in the direction of a force. This will decrease the potential energy and increase the kinetic energy. Examples of this can be found in different forms of energy, Mechanical energy Chemical energy Electrical energy
8 Mechanical Energy Mechanical energy is based on the position and movement of an object Mechanical energy can be created by different forces: gravity, pressure, humans, etc.
9 Mechanical Potential Energy Potential: A ball being held has potential energy. The amount of energy is related to the height at which it is being held. The potential energy comes from gravity pulling on the ball.
10 Mechanical Kinetic Energy Potential => Kinetic: When the ball is released it will begin to fall. This will decrease its distance from an origin point such as the ground, therefore decreasing its potential energy. The ball will move towards the ground at an increasing speed, therefore increasing kinetic energy. Observation: The higher the ball Is held, the greater the potential energy.
11 Chemical Energy Chemical energy is based on the bonds between atoms. Chemical energy is released when a chemical reaction occurs; such as burning or mixing chemicals.
12 Chemical Potential Energy Potential: A molecule (group of atoms bound together), such as methane, has potential energy. The bonds between the atoms store the potential energy.
13 Chemical Kinetic Energy Potential => Kinetic: When the methane is ignited, the bonds of the atoms break. This releases kinetic energy such as heat and light. Observation: In this transformation, new bonds are created between the atoms. Therefore, potential energy still exists, just in new molecules.
14 Electrical Energy Electrical energy is based on the position and movement of electrons. Moving electrons is known as current. This is related to kinetic energy. The strength of forces acting on stationary electrons is known as voltage. This is related to potential energy.
15 Electrical Energy Electrons repel each other A buildup of electrons in one place will create a force that pushes the electrons away This force causes a voltage or potential energy If the electrons are able to move, the potential energy will cause a current or kinetic energy in the electrons
16 Magnetic Energy Magnetic energy is based on the attraction, or repulsion, of two magnets Or a magnet and a magnetically susceptible object Iron, etc.
17 Magnetic Energy Remember the suspended ball and gravity In magnetism, potential energy can be created by suspending objects pulled on or pushed by a magnet When allowed to move freely, the potential energy will transform into kinetic energy
Magnetic energy can be transformed into electrical energy Electrical and Magnetic Relations
Potential: When a magnet is moved near an open strand of wire, potential energy is created on one end of the wire. Movement of electrons towards one end of the wire creates an electrical force. This force is the source of the potential energy. 19 Electrical and Magnetic Relations Voltage (Volts)
20 Electrical/Magnetic Kinetic Energy Potential => Kinetic: When the two ends of the wire are connected, the negative particles are able to move towards the other end. The movement of these particles is kinetic energy. Current (Amps) Electron Flow
22 1.List the various kinds of energy that were seen in the experiment and where they were seen. 2.Can this form of energy be used on a large scale? Could it power more then a light bulb? What Did We See?
23 How do We Get Electricity at Home? 1.Steam power – about 90% 2.Wind power – about 10% 3.Hydroelectric power – less than 1%